``--auto-boundary`` is a process that seeks to limit the boundaries of the reconstruction based upon a K-Means filtered Convex Hull buffered by 20x the mean GSD of the dataset.
``--auto-boundary`` is appropriate to use on any dataset where one might possibly consider limiting the area of reconstruction due to the presence of sky or far-away background that they would not normally consider part of the desired reconstruction.
``--auto-boundary`` does not have a meaningful impact on nadir (or near-nadir) imagery without sky/background, making it superfluous, but safe, to include.
Auto-Boundary is most helpful in preventing the reconstruction area from growing needlessly large when things like sky, clouds, or far-away features like treelines get included in the reconstruction.
By preventing the boundaries of the reconstruction from growing needlessly large, Out-Of-Memory errors become far less likely, and one will likely see a decrease in processing time due to the smaller area being reconstructed.
:alt:WebODM displaying the reconstruction extent of a terrestrial orbit survey of a Northern Catalpa tree.
The WebODM 3D View shows the full extent of the recosntruction. Compared to the ``--auto-boundary`` reconstruction above, one can see that the full reconstruction area is much larger (and therefore more visually sparse).
